#include <fstream>
using namespace std;
ifstream fin("fractal.in");
ofstream fout("fractal.out");
int k,x,y,L;
int fractal(int x,int y,int val)
{
if (val<0) return 0;
L=1<<val;
if ((x<=L) && (y<=L)) return fractal(y,x,val-1);
if ((x>L) && (y<=L)) return L*L+fractal(x-L,y,val-1);
if ((y>L) && (x>L)) return 2*L*L+fractal(x-L,y-L,val-1);
return 3*L*L+fractal(2*L-y+1,L-x+1,val-1);
}
int main()
{
fin>>k>>x>>y;
long rez=fractal(x,y,k);
fout<<rez;
}